Which two methods， inserted individually， correctly complete the Three class？（）
A. public void foo（）{ }
B. public int foo（）{return 3；}
C. public Two foo（）{return this；}
D. public One foo（）{return this；}
E. public Object foo（）{return this；}
企业数据仓库的建设通常按照快速原理予以实施，主要包括（）。
A. 确定目标
B. 环境评估
C. 环境分析
D. 环境测试
下面这段代码中，变量subString的结果是（）。 DimaStringAsString="LeftCenterRight" DimsubStringAsString subString=Mid(aString,13)
A. "_Right"
B. "Right_"
C. "Right"
D. "LeftCenter_"
E. "LeftCenter"
F. "_LeftCenter_"
G. "LeftCenterR"
Which one statements is true？（）
A. Compilation fails.
B. An exception is thrown at runtime.
C. The attribute id in the ItemTest object remains unchanged.
D. The attribute id in the ItemTest object is modified to the new value.
E. A new ItemTest object is created with the preferred value in the id attribute.
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